package exp5.Part4;

import javax.crypto.KeyAgreement;
import javax.crypto.spec.SecretKeySpec;
import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.security.PrivateKey;
import java.security.PublicKey;

public class KeyAgree {
    public static void main(String args[ ]) throws Exception{
        // 读取对方的DH公钥
        FileInputStream f1=new FileInputStream("Pub.dat");
        ObjectInputStream b1=new ObjectInputStream(f1);
        PublicKey  pbk=(PublicKey)b1.readObject( );
//读取自己的DH私钥
        FileInputStream f2=new FileInputStream("Bpri.dat");
        ObjectInputStream b2=new ObjectInputStream(f2);
        PrivateKey  prk=(PrivateKey)b2.readObject( );
        // 执行密钥协定
        KeyAgreement ka=KeyAgreement.getInstance("DH");
        ka.init(prk);
        ka.doPhase(pbk,true);
        //生成共享信息
        byte[ ] sb=ka.generateSecret();
        for(int i=0;i<sb.length;i++){
            System.out.print(sb[i]+",");
        }
        SecretKeySpec k=new  SecretKeySpec(sb,"DESede");
    }
}
